沼气发酵残余物对叶菜硝酸盐积累的影响

通过正交实验 ,分析沼气发酵残余物 (沼液、沼渣 )作为肥料 ,其施肥量、配施品种、施用方式等因素对油菜和菠菜硝酸盐积累的影响。影响菠菜硝酸盐积累的显著因素按作用程度大小依次为硫酸铵、沼渣和喷施沼液。油菜的显著因素依次为硫酸铵、沼渣和灌施沼液。并根据维持较高产量水平的基础上硝酸盐含量较低的原则 ,确定了优选的施肥方案。结果表明 ,采用沼渣作底肥 ,配合沼液追肥 ,生产的蔬菜满足高产和优质的双重目的 ,既利用了农业废物 ,避免沼气池的二次污染 ,又节约化肥 ,降低生产成本 ,具有一举数得的优点

Effects of Anaerobic Fermentation Residues on Nitrate Accumulation in Leaf Vegetables

A set of orthogonal experiments was conducted to study effects of Anaerobic Fermentation Residues (AFR) on nitrate accumulation in rape and spinach, respectively. In the sequence of significance, the factors which contribute to the nitrate accumulation significantly in spinach were ammonium sulfate, digested sewage and sprayed digested slurry, while in rape, the order was: ammonium sulfate, digested sewage and irrigated digested slurry. The measure for fertilization was optimized according to the principle of high yield and low nitrate. The results showed that applying AFR on vegetables was a procedure of being able to utilize the agricultural waste, to avoid the pollution of anaerobic fermentation, to reduce the production cost by saving the chemical fertilizer, facilitating the demands for high yield and quality.